Automatic Spectrum-Scope (ASC)Īdvanced Spectrum Scope with ASC (Automatic Spectrum-Scope Control) located just below the LCD display gives the operator all the information for comfortable QSO on the DXing scene. This proven receiver design architecture enables elimination of unwanted signals through filters at each stage as well as optimized gain distribution. The triple conversion circuit structure allows highly flexible gain distribution at each stage. The 1st IF frequency incorporates selectable robust 3 kHz and 15 kHz roofing filters that effectively attenuate interfering signals. The high-speed floating point TMS320C6746 DSP chip (3000 MIPS / 2250 MFLOPS) from Texas Instruments used in the receiver design guarantees excellent interference rejection with actual signals under real-world conditions, not only on HF but also in the VHF and UHF bands. Recognizing an all-important Golden Rule Amateur Radio – “You cannot work them if you cannot hear them”– the FT 991A features a rugged state-of-the-art highly balanced receiver circuit configuration. State of the Art Digital Signal Processing
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